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Ursa Astronomical Association
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Ursa Astronomical Association

SH2-101 - 16.8.2015 at 00.00 Hyvinkää Observation number 44223

Visibility II / V

Timo Inkinen, Ursa (Etelä-Suomi)

The shooting season of autumn 2015 started with the filming of Tulip Fog on August 16-19, 2015 from the still partially bright night sky. The image has been exposed for four nights for a total of 7h 36min. This mist is a hydrogen emission mist whose photographic brightness is strongly concentrated in the red color channel while the other color channels remain rather weak in intensity. The fog is named after its appearance, but visually this fog seems (?) To be quite difficult to detect due to its large 16'x9 'size and low surface brightness. My apologies for the delay in image processing until October ...

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • SH2-101
    • Heikosti näkyvä
  • Constellation
    • Cygnus
  • Brightness in magnitudes
    • 9
  • Field of view
  • 50 arc minutes
  • Weather
    • Ei vielä täysin pimeää eli aurinko osittain alle -18 astetta horisontin alla. Muutoin hyvä läpinäkyvyys.
  • Darkness
    • Good
  • Seeing
    • Good
  • Limiting magnitude
    • 5.5
  • Nebulae
    • Dark nebula info

      Dark nebulae are dust in space. It obsruct the visibility of background star and bright nebulae. Thus, the dark nebulae are seen as dark clouds in space.


      The Horsehead Nebula is a dark nebula. Image Arto Murtovaara.


      The dark nebula LDN 1235 in Cepheus. Image Juha Kepsu.


      The dark nebula LDN 1302. Image Tero Turunen.


      The NGC 1333 is a reflection nebula, which includes also dark nebulae. Image Samuli Vuorinen.

    • Emission nebula info

      In an emission nebula the hot stars nearby cause the gas glow. This should not mix with reflection nebula, where the gas is only lit up by nearby stars.

      The appearance of a gas nebula is irregular, and the fainter parts of it need bigger instruments to be visible.


      Emssion nebulae in Cepheus. The bigger part is composed of the nebulae Cederblad 214 (Ced214) and NGC 7822. The lower round nebula is called Sharpless 170 (Sh2-170). Image J-P Metsävainio.


      The Orion nebula. Image Samuli Vuorinen.


      In this 4-degree-field there are emission nebulae Sh2-157, Sh2-158, Sh2-159, Sh2-161 and Sh2-162 (or NGC 7635 aka Bubble Nebula) and open clusters M52 and NGC 7510. Image Juha Kepsu.


      NGC 281 aka Pacman Nebula. The object is in Cassiopeia. Image J-P Metsävainio.


      NGC 896 in Cassiopeia is the tip of Heart Nebula (IC 1805). Image Timo Inkinen.

Technical information

Shooting with a 10 "/f5.3 RCT telescope and QSI 583ws CCD camera and Astrodon LRGBHa filters. Individual exposures were 12min long (L 7x12min = 84min + R 8x12min = 96min + G 8x12min = 96min + B 8x12min = 96min + Ha = 7x12min = 84min ), of which the total exposure became 456min In image processing, I mixed the images of the Ha channel into both the R and L channels when I compiled the LRGB image.

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